Honey bees congregate on top of frames as their hives are checked for queen activity and receive routine maintenance as part of a collaboration between the Cincinnati Zoo and TwoHoneys Bee Co., Wednesday, May 27, 2015, at EcOhio Farm in Mason, Ohio. A federal rule to be proposed Thursday, May 28, would create temporary pesticide-free zones when certain plants are in bloom around bees that are trucked from farm to farm by professional beekeepers, which are the majority of honeybees in the U.S. (AP Photo/John Minchillo)
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